Surface structure and catalytic activity of MoO/sub 3//Al/sub 2/O/sub 3/ catalysts in the hydrodesulfurization of thiophene studied by X-ray photoelectron spectroscopy

Journal Article · Thu Jul 10 00:00:00 EDT 1980 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100451a019· OSTI ID:6212247

Okamoto, Y; Tomioka, H; Katoh, Y; Imanaka, T; Teranishi, S

Catalysts containing 2.4-23.1% molybdenum trioxide on alumina were calcined and either tested for their activity for thiophene hydrodesulfurization without further pretreatment, or hydrogen-reduced or sulfided (CS/sub 2/ + H/sub 2/) before the activity tests. The catalysts were also characterized by pyridine adsorption, extraction of molybdenum with water and aqueous ammonia solution, and ESCA of the sulfided catalysts. The intrinsic hydrodesulfurization activity correlated with the sulfur-molybdenum ratio in a volcano-shaped plot with the peak at the 1:1 ratio, and it was independent of pretreatment and molybdenum content. At low molybdenum contents and for partial sulfidation, a 1:1 sulfur/molybdenum(IV) (S/Mo1) species formed; on fully sulfided catalysts an MoS/sub 2/ species was also present; and the S/Mo1 species had a much higher intrinsic activity than MoS/sub 2/. Apparently, the high anion vacancy concentration of the S/Mo1 promoted the reaction. The surface structure of the sulfided catalyst and the molybdenum redox cycle are discussed.

• Research Organization: Osaka Univ.
• OSTI ID: 6212247
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 84:14; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AZINES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CORRELATIONS
DATA
DESULFURIZATION
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HYDROGEN
INFORMATION
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
MOLYBDENUM SULFIDES
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PROMOTERS
PYRIDINE
PYRIDINES
QUANTITY RATIO
REACTION INTERMEDIATES
REFRACTORY METAL COMPOUNDS
SORPTION
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
SULFIDATION
SULFIDES
SULFUR COMPOUNDS
SURFACE PROPERTIES
SYNTHESIS
TESTING
THIOPHENE
TRANSITION ELEMENT COMPOUNDS
X-RAY SPECTROSCOPY